Open hearth furnace



Dec. 29, 193i. G. E. ROSE OPEN HEARTH FURNACE Filed Jan. 20, 1930 Patented Dec. 29, 1931 UNITED STATES GEORGE E. ROSE, F CHICAGO, ILLINOIS OPEN HEARTH FURNACE Application filed January 20,v 1930. Serial No. 421,997.

This invention relates to open hearth furnaces.

More specifically, it relates to improvements in means for supplying fuel and air to the furnace and for removing the products of combustion.

A principal object of the invention is to provide `an improved end construction wherey proper mixing of air and fuel gas may be obtained.

Another principal object is to provide means for withdrawing the fuel supply means to4 prevent rapid destruction thereof when hot, burned gases are passing it.

Another object is to provide :means for passing suiiicient of the burned gases through the fuel gas preheating checker chamber to obtain the desired degree of preheat.

These and other objects, which will be ap- ?-0 parent, are accomplished by constructing and operating a movable port member as lllus- `trated in the drawings and hereinafter de scribed Iin detail.

1n the drawings:

Figure 1 is a vertical. cross section through an open hearth furnace in which the invention has been embodied; and,

Figure 2 is a horizontal cross section taken on the line 2-2 of Figure 1.

The drawings illustrate in general a conventional form of open hearth furnace modilied to incorporate the features of this invention. The sloping wall hearth 1 and the top wall 2 are of any conventional construction.

Each end of the furnace is exactly the same in construction and in the followinodecription one end only will be describe as it is to be understood that the construction of the other end is exactly the same. rlhe end chambers of the furnace have the usual cross sectional shape with a substantially horizontal bottom portion 3 and a downwardly sloping top portion 4 joining the top wall 2. The vertical end wall 5 has a centrally located passage 6 therethrough. The passage 6 is lined with a water cooled jacket 7 to support and protect the brick work.

A pair of ilues 8 communicate with the end chamber at opposite sides thereof adjacent the side walls 9 and the end wall 5 of the end chamber. The lues 8 communicate with a checker work chamber 10.

A burned gas downtake flue 11 communicates with the end chamber intermediate the ilues 8. The down-take flue 11 extends downwardly outward from the end chamber to a checker work chamber 12.

A fuel gas up-take flue 13 communicating with the checker chamber 12 extends upwardly outward and terminates below the level of the passage 6 through the end wall. The burned gas down-take flue 11 and the fuel-gas up-take flue 13 come together at about the same angle with respect to the vertical.

A water cooled damper 14 hinged at the junetion of the two fiues is mounted to be swung to close either of the two iues and to simul taneously open the other.

The brick work, which forms the up-take flue 13 forms a base for a. horizontal water cooled plate 15. The 'plate 15 extends out wardly from the flue 13 for a purpose to be hereinafter described.

A removable conduit or port member 16 is slidably mounted with respect to the plate l5 and is provided with a nozzle portion 17 adapted to extend through the passage 6 into the furnace. Although the nozzle opening is shown, as circular, it is to be understood that it may be of any suitable shape thatmight be found advantageous, such as half round, half oval, or flattened. The port member 16 is provided with a water cooled jacket 18, which makes a substantially gas-tight lit with the plate 15 and with the lining 7 in the passage 6 through the end wall 5 of the furnace. The nozzle portion 17 of the port member terminates in a constrict-ed outlet directed at a slight angle downwardly. The other end of the port member is positioned to register with the up-take flue 13 when in one position. A rack 19 connected to the memer 16 forms a means for reciprocating said member. Power driven means 2O operate the rack 19 and simultaneously the damper 14.

In the operation of the furnace, the operating mechanism is adjusted so that when one port member 16 is inserted within the furnace, as shown at the left handy side of the drawings, the other port member 16 will be withdrawn, as shown at the right hand side of the drawings. The means for operating the dampers 14 are also interconnected with the means for reciprocating the port members so that, when the port member 16 is inserted within the furnace, the damper 14 will close the burned gas down-take iiue and open the fuel gas up-take flue, as shown at the left hand side of the drawings. When the port member 16 is withdrawn from the furnace, the damper is shifted to open the burned gas dovntake and close the fuel gas up-take.

This description of the operation Will make it clear that preheated fuel gas from the checker chamber 12 is delivered through the port member 16 and from the nozzle por-y tion 17 into the furnace at a comparatively high velocity and at the proper angle from the end chamber of the furnace. Air under the proper pressure delivered through the iiues 8 mixes with the expanding gas being discharged from the nozzle 17 and the mixture ignites. The hot combustion gases at the other end of the furnace pass downwardly through the lues 8 and through the burned gas down-take 11, which was opened when the port member 16 at the end was withdrawn from the furnace.

The construction and operation as described allows the fuel gas conduit or delivery member to be withdrawn from the path of the hot flame, thereby preventing its rapid destruction. By this improved constructionl it is also possible to make the burned gas down-take 11 of larger cross sectional area than the discharge nozzle 17 of the port member and to thereby pass sufficient of the burned gases through the fuel gas p'reheating chamber to obtain the desired degree of superheat or pre-heat for efficient operation.

It is to be understood that the particular construction shown in the drawings is only one form which the device may take, and applicant limits his invention only by the scope of the appended claims.

What is claimed is:

1. In a reversible open hearth furnace, a burned gas down-take communicating with the furnace, a fuel gas u1)-tale,terminating outside the furnace, a fuel gas delivery member movable into and out ofthe furnace and into and out of registry with the outside end of the fuel gas up-take, and means for closing the burned gas down-take and opening the fuel gas up-take when said delivery memer is in registry with the fuel gas 11p-take 2. In a reversible open hearth furnace, a burned gas down-take communicating with the furnace, a fuel gas up-take terminating outside the furnace, a fuel gas delivery member movable into and out of the furnace and into and out of registration with the outside end of tbe fuel gas 11p-take, means for simultaneously closing the burned gas down-take and opening the fuel gas up-take when said delivery member is in registration with the fuel gas uptake flue.

3. In a. reversible regenerative open hearth furnace, a fuel gas supply chamber for each end of the furnace, a burned gas down-take communicating with each end of the furnace and with one of said chambers, a fuel gas urp-take communicating with each of said chambers and terminating outside the respective ends of the furnace, and a. fuel gas delivery member at each end of the furnace adapted to be moved into and out of the furnace and into and out of registration with the corresponding fuel gas up-take.

4. In a reversible regenerative open hearth furnace, a fuel gas supply chamber for each end of the furnace, a burned gas down-take communicating with each end of the furnace and with one of said chambers, a fuel gas uptake communicating with each of said chambers and terminating outside the respective ends of the furnace, a fuel gas delivery member at each end of the furnace adapted to be moved into and out of the furnace and into and out of registration with the corresponding fuel gas up-take, and means for closing the burned gas down-takes and opening the fuel gas up-takes at either end of the furnace wh-en the delivery member at that end is in registration with the fuel gas up-take. 5. In a reversible regenerative open hearth furnace, a fuel gas supply chamber for each end of the furnace, a burned gas down-take communicating with each end of the furnace and with one of said chambers, a fuel gas uptake communicating with each of said cham,- bers and terminating outside the respective ends of the furnace, a fuel gas delivery membcr at each end of the furnace adapted to be moved into and out of the furnace and into and out of registration with the corresponding fuel gas up-talie, and means for simultaneously closing the burned gas down-takes and opening the fuel gas 11p-takes at either end of the furnace when the delivery member at that end is in registrtion with the fuel gas up-take.

6. In a reversible regenerative open hearth furnace, a fuel gas supply chamber for each end of the furnace, a burned gas down-take communicating with each end of thcl furnaceand with one of said chambers, a fuel gas up-take communicating with each of said chambers and terminating outside the respective ends of the furnace, a fuel gas delivery member at each end of the furnace adapted to be moved into and out of the furnace and into and out of registration with the corresponding fuel gas up-take, and a damper for simultaneously closing the burned gas down-takes and opening the fuel gas up-takes at either end of the furnace when the delivery member at that end is in registration with the fuel gas 11p-take.

7. In a reversible regenerative open i hearth furnace, a fuel gas supply chamber 5 for each end of the furnace, a burned gas ldown-take communicating With each end of l the furnace and with one of said chambers, a fuel gas up-take communicating with each of said chambers andterminating outside the respective ends of the furnace, a fuel gas delivery member at each end of the furnace adapted to be moved into and out of the furnace and into and out of registration with the corresponding fuel gas up-take, and means for closing the burned gas down-takes and opening the fuelup-takes at either end of the furnace when the delivery member at that end is in registration with the fuel gas 11p-take, said means being adapted to open the burned gas down-take and close the fuel gas 11p-take When said delivery member is withdrawn from the furnace and out of registration with the up-take.

8. In a reversible y regenerative open hearth furnace, a pair of spaced fiues communicating with each end of the furnace and adapted to serve alternately as air up-takes and burned gas down-takes, a burned gasl down-take communicating with the central portion of each end of the furnace between the first named iiues, said down-takes communicating with fuel gas `preheating chambers, a fuel gas up-take flue at each end of the furnace communicating with said chambers and terminating outside and adjacent the ends of the furnace, a base plate extending over each gas up-take ue and extending outwardly therefrom, each plate having an opening therethrough over the respective i'iues, acentrally positioned passage through each end wall, port members movable through said passages into and out of the ends of the furnace, said members being elbow-shaped, one end extending substantially horizontally in the direction of its movement into the furnace, the other end of said member resting on the base plate and being adapted to communicate with the fuel gas up-take flue, means for moving the port members into and out of the furnace, constricted portions at the forward ends of said members to provide discharge nozzles, said portions being angled to direct the gases slightly downwardly, a damper positioned at the junction of the burned gas down-take und the fuel gas up-take, means for operating said damper to close the burned gas downtake and simultaneously to open the fuel gas rip-take when the nozzle Iis inserted in the furnace and to open the burned gas down take and close the fuel gas up-take When the port member is Withdrawn from the furnace. In testimony whereof I aiiix my signature.

GEORGE E. ROSE. 

